AutoCodes – Toyota – P0137 2009 Toyota Prius

P0137 2009 Toyota Prius Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P0137 2009 Toyota Prius indicates Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Rear Heated Oxygen Sensor Bank 1, Rear Heated Oxygen Sensor Bank 1 harness is open or shorted, Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 8,685

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0137 2009 Toyota Prius Description

The heated oxygen sensor 2 (HO2S), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. For optimum catalyst operation, the air fuel mixture (air-fuel ratio) must be maintained near the ideal stoichiometric ratio. The HO2S output voltage changes suddenly in the vicinity of the stoichiometric ratio. The Engine Control Module (ECM) adjusts the fuel injection time so that the air-fuel ratio is nearly stoichiometric. The HO2S generates a voltage between 0.1 and 0.9 V in response to oxygen in the exhaust gas. If the oxygen in the exhaust gas increases, the air-fuel ratio becomes Lean. The ECM interprets Lean when the HO2S voltage is below 0.45 V. If the oxygen in the exhaust gas decreases, the air-fuel ratio becomes Rich. The ECM interprets Rich when the HO2S voltage is above 0.45 V.

OBDII Code P0137 2009 Toyota Prius - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0137 2009 Toyota Prius Code - Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0137 2009 Toyota Prius?

Faulty Rear Heated Oxygen Sensor Bank 1
Rear Heated Oxygen Sensor Bank 1 harness is open or shorted
Rear Heated Oxygen Sensor Bank 1 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

How to Fix the DTC P0137 2009 Toyota Prius?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor Bank 1 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0137 2009 Toyota Prius code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0137 2009 Toyota Prius code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0137 2009 Toyota Prius Code

1. What does the OBDII code P0137 mean on a 2009 Toyota Prius?

The code P0137 indicates an issue with the Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2 on a 2009 Toyota Prius.

2. What are the common symptoms of a P0137 code on a 2009 Toyota Prius?

Common symptoms include poor fuel economy, rough idling, engine hesitation, and a noticeable decrease in overall engine performance.

3. What are the possible causes of a P0137 code on a 2009 Toyota Prius?

Potential causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or issues with the engine's air-fuel ratio.

4. How can I diagnose a P0137 code on my 2009 Toyota Prius?

Diagnosing a P0137 code typically involves using an OBDII scanner to retrieve the code, inspecting the oxygen sensor and related wiring, and checking for any exhaust system leaks.

5. Can I drive my 2009 Toyota Prius with a P0137 code?

While it is possible to drive the vehicle with a P0137 code, it is not recommended as it can lead to further damage and reduced fuel efficiency. It's best to address the issue promptly.

6. How can I repair a P0137 code on my 2009 Toyota Prius?

Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, fixing exhaust leaks, or addressing any issues with the air-fuel ratio.

7. Is it safe to ignore a P0137 code on a 2009 Toyota Prius?

Ignoring a P0137 code can lead to decreased fuel efficiency, potential damage to the catalytic converter, and overall poor engine performance. It is recommended to address the issue as soon as possible.

8. Can a P0137 code on a 2009 Toyota Prius cause the check engine light to turn on?

Yes, a P0137 code will trigger the check engine light on the dashboard of a 2009 Toyota Prius to alert the driver of an issue with the Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 2.

9. How much does it typically cost to repair a P0137 code on a 2009 Toyota Prius?

The cost of repairing a P0137 code can vary depending on the underlying issue. Replacement oxygen sensors can range from $50 to $200, while repairing wiring or addressing exhaust leaks may incur additional labor costs.

10. Can a DIY enthusiast fix a P0137 code on a 2009 Toyota Prius?

While some aspects of diagnosing and repairing a P0137 code may be DIY-friendly, it is recommended to have a professional mechanic perform the repairs to ensure proper diagnosis and resolution of the issue.